On 05.07.21 09:10, Pierre-Loup Gosse via Xenomai wrote: > Hi, > > For a client project I try to port Xenomai 3.1 + I-pipe to the kernel > linux-imx 5.4.70 for arm64 (i.MX8 Mini). I adapted the I-pipe patch > (5.4.72-arm64). The kernel boots and works well. >
I think the imx8mm is fairly well supported in upstream by now. Maybe worth to have a look at 5.10-dovetail and the Xenomai devel branch (upcoming 3.2) so that you do not need to fiddle with the downstream linux-imx mess in your product. I think Philippe is even testing on imx8mm, but I might be wrong. > However, for the non-regression test, I run a client test that uses > Xenomai and UDD (to register a PCIe driver). The test waits for a > hardware IRQ from a PCIe device. This IRQ is never received which lead > the test to fail. To be more precise, after running the test, Xenomai > show that no IRQs was received for this device: > > # cat /proc/xenomai/irq > IRQ CPU0 CPU1 CPU2 CPU3 > 3: 4027 14050 3708 4488 [timer/0] > **223: 0 0 0 0 netx00 > 1031: 0 0 0 0 [sync] > 1032: 1 1 1 0 [timer-ipi] > 1033: 0 0 0 0 [reschedule] > 1037: 0 44 0 0 [virtual] > > 'netx00' is our device with the IRQ 223. > /proc/xenomai/irq simply reads the irqall counter per CPU per IRQ > (/__ipipe_cpudata_irq_hits/). This means that no IRQ 223 went through > the I-pipe, or worse, not even sent. > > But in comparison, I reproduced this test with the old client image > (Xenomai 3.1 + I-pipe on the kernel linux-imx 4.14.98) on the same > hardware (arm64 i.MX8 Mini). The test passed and Xenomai received IRQs > for 'next00'. > > This leads me to the conclusion that on the new kernel our IRQ is sent > but does not pass through the I-pipe. > > I noticed that some irq handler functions from driver do not use the > /ipipe_handle_domain_irq/ or /ipipe_handle_demuxed_irq/ but the generic > function, respectively /handle_domain_irq/ and /generic_handle_irq/. > Especially for the imx irqchip (_drivers/irqchip/irq-imx-intmux.c_ and > _drivers/irqchip/irq-imx-irqsteer.c_). I patched these files to use > /ipipe_handle_demuxed_irq/ rather than /generic_handle_irq/. But > /proc/xenomai/irq still shows 0 IRQs and the test still fails. > > Am I doing things right ? Or am I missing something ? Greg may provide some hints here from his porting to 5.4. Jan -- Siemens AG, T RDA IOT Corporate Competence Center Embedded Linux
